Get you Join Types Poster

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Available for both SQL Server (TSQL) and MySQL.

The poster includes detailed graphical representations of several join types: inner join, left outer join, right outer join, cross join, multiple joins, as well as more advanced join types such as cross apply and outer apply. To facilitate easy recognition, each join type is illustrated in a separate section. Furthermore, each section provides a succinct description of the join type, as well as a practical SQL Server use case.

To provide some context, the inner join, the most frequently used join type, retrieves only those rows that possess matching data in both tables. The left outer join yields all rows from the left table in conjunction with the matching rows from the right table. Analogously, the right outer join procures all rows from the right table and the matching rows from the left table. The cross join procures the Cartesian product of two tables, combining every row from both tables. When it comes to cross apply and outer apply, these operators function like inner and outer joins but have the added benefit of being able to call a table-valued function for each row returned by the outer table expression.

This poster is an indispensable tool for any SQL Server practitioner seeking to swiftly comprehend the various join types. It is especially beneficial for those just starting their SQL Server journey or for seasoned professionals looking to refresh their knowledge. This and more join types are included in the SQL join types poster I’ve created for your reference.

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